Nometallho

Nometallho, elementhoi khimiyavie, ki khosiyati metalli nadorand. Istilohi «metalloidho», ki bazan baroi ifodai Nometallho kor mefarmoyand az bayn raftaast. Ba Nometallho 22 elemeti mansub ast: gidrogen, nitrogen, oksigen, ftor, khlor, gazhoi inerti, brom, bor, karbon, silitsiy, fosfor, sulfur, arsen, selen, tellur, yod va astat. Atomi Nometallho elektron payvast karda anionhoi sodda (S1—, O²—) yo murakkab (SlO—₄, SO²—₄, RO³—₄) hosil mekunand.

Dar sistemai davrii elementhoi Mendeleev elektromanfiyati Nometallho dar ka tor az metallhoi ishqori ba tarafi rost va dar guruuh az poyon ba bolo meafzoyad. Nometallho bo oksigen oksidhoi kislotagi—angidridi kislotaho hosil menamoyand. Payvasthoi soddai gidrogenii Nometallho dar sharoiti mutadil moddahoi gaziand. Dar vaqti bo hamdigar payvast shudan (masalan, ClF, ICI, CS₂ va gayra) bandi kovalenti, hangomi bo metallho payvast shudan (masalan, KSl, MgO, A1Vr₃ va gayra) bandi ioni hosil mekunand. Nometallho dar khojagii qishloq ahamiyati kalon dorand.